diff options
Diffstat (limited to 'src/grp-journal/systemd-cat')
| -rw-r--r-- | src/grp-journal/systemd-cat/Makefile | 35 | ||||
| -rw-r--r-- | src/grp-journal/systemd-cat/cat.c | 161 | ||||
| -rw-r--r-- | src/grp-journal/systemd-cat/systemd-cat.completion.bash | 57 | ||||
| -rw-r--r-- | src/grp-journal/systemd-cat/systemd-cat.completion.zsh | 12 | ||||
| -rw-r--r-- | src/grp-journal/systemd-cat/systemd-cat.xml | 178 |
5 files changed, 443 insertions, 0 deletions
diff --git a/src/grp-journal/systemd-cat/Makefile b/src/grp-journal/systemd-cat/Makefile new file mode 100644 index 0000000000..77c0861f2c --- /dev/null +++ b/src/grp-journal/systemd-cat/Makefile @@ -0,0 +1,35 @@ +# -*- Mode: makefile; indent-tabs-mode: t -*- +# +# This file is part of systemd. +# +# Copyright 2010-2012 Lennart Poettering +# Copyright 2010-2012 Kay Sievers +# Copyright 2013 Zbigniew Jędrzejewski-Szmek +# Copyright 2013 David Strauss +# Copyright 2016 Luke Shumaker +# +# systemd is free software; you can redistribute it and/or modify it +# under the terms of the GNU Lesser General Public License as published by +# the Free Software Foundation; either version 2.1 of the License, or +# (at your option) any later version. +# +# systemd is distributed in the hope that it will be useful, but +# WITHOUT ANY WARRANTY; without even the implied warranty of +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU +# Lesser General Public License for more details. +# +# You should have received a copy of the GNU Lesser General Public License +# along with systemd; If not, see <http://www.gnu.org/licenses/>. +include $(dir $(lastword $(MAKEFILE_LIST)))/../../../config.mk +include $(topsrcdir)/build-aux/Makefile.head.mk + +systemd_cat_SOURCES = \ + src/journal/cat.c + +systemd_cat_LDADD = \ + libjournal-core.la + +bin_PROGRAMS += \ + systemd-cat + +include $(topsrcdir)/build-aux/Makefile.tail.mk diff --git a/src/grp-journal/systemd-cat/cat.c b/src/grp-journal/systemd-cat/cat.c new file mode 100644 index 0000000000..105d42591e --- /dev/null +++ b/src/grp-journal/systemd-cat/cat.c @@ -0,0 +1,161 @@ +/*** + This file is part of systemd. + + Copyright 2012 Lennart Poettering + + systemd is free software; you can redistribute it and/or modify it + under the terms of the GNU Lesser General Public License as published by + the Free Software Foundation; either version 2.1 of the License, or + (at your option) any later version. + + systemd is distributed in the hope that it will be useful, but + WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public License + along with systemd; If not, see <http://www.gnu.org/licenses/>. +***/ + +#include <errno.h> +#include <fcntl.h> +#include <getopt.h> +#include <stdio.h> +#include <stdlib.h> +#include <unistd.h> + +#include <systemd/sd-journal.h> + +#include "systemd-basic/fd-util.h" +#include "systemd-basic/parse-util.h" +#include "systemd-basic/string-util.h" +#include "systemd-basic/syslog-util.h" +#include "systemd-basic/util.h" + +static const char *arg_identifier = NULL; +static int arg_priority = LOG_INFO; +static bool arg_level_prefix = true; + +static void help(void) { + printf("%s [OPTIONS...] {COMMAND} ...\n\n" + "Execute process with stdout/stderr connected to the journal.\n\n" + " -h --help Show this help\n" + " --version Show package version\n" + " -t --identifier=STRING Set syslog identifier\n" + " -p --priority=PRIORITY Set priority value (0..7)\n" + " --level-prefix=BOOL Control whether level prefix shall be parsed\n" + , program_invocation_short_name); +} + +static int parse_argv(int argc, char *argv[]) { + + enum { + ARG_VERSION = 0x100, + ARG_LEVEL_PREFIX + }; + + static const struct option options[] = { + { "help", no_argument, NULL, 'h' }, + { "version", no_argument, NULL, ARG_VERSION }, + { "identifier", required_argument, NULL, 't' }, + { "priority", required_argument, NULL, 'p' }, + { "level-prefix", required_argument, NULL, ARG_LEVEL_PREFIX }, + {} + }; + + int c; + + assert(argc >= 0); + assert(argv); + + while ((c = getopt_long(argc, argv, "+ht:p:", options, NULL)) >= 0) + + switch (c) { + + case 'h': + help(); + return 0; + + case ARG_VERSION: + return version(); + + case 't': + if (isempty(optarg)) + arg_identifier = NULL; + else + arg_identifier = optarg; + break; + + case 'p': + arg_priority = log_level_from_string(optarg); + if (arg_priority < 0) { + log_error("Failed to parse priority value."); + return -EINVAL; + } + break; + + case ARG_LEVEL_PREFIX: { + int k; + + k = parse_boolean(optarg); + if (k < 0) + return log_error_errno(k, "Failed to parse level prefix value."); + + arg_level_prefix = k; + break; + } + + case '?': + return -EINVAL; + + default: + assert_not_reached("Unhandled option"); + } + + return 1; +} + +int main(int argc, char *argv[]) { + _cleanup_close_ int fd = -1, saved_stderr = -1; + int r; + + log_parse_environment(); + log_open(); + + r = parse_argv(argc, argv); + if (r <= 0) + goto finish; + + fd = sd_journal_stream_fd(arg_identifier, arg_priority, arg_level_prefix); + if (fd < 0) { + r = log_error_errno(fd, "Failed to create stream fd: %m"); + goto finish; + } + + saved_stderr = fcntl(STDERR_FILENO, F_DUPFD_CLOEXEC, 3); + + if (dup3(fd, STDOUT_FILENO, 0) < 0 || + dup3(fd, STDERR_FILENO, 0) < 0) { + r = log_error_errno(errno, "Failed to duplicate fd: %m"); + goto finish; + } + + if (fd >= 3) + safe_close(fd); + fd = -1; + + if (argc <= optind) + (void) execl("/bin/cat", "/bin/cat", NULL); + else + (void) execvp(argv[optind], argv + optind); + r = -errno; + + /* Let's try to restore a working stderr, so we can print the error message */ + if (saved_stderr >= 0) + (void) dup3(saved_stderr, STDERR_FILENO, 0); + + log_error_errno(r, "Failed to execute process: %m"); + +finish: + return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS; +} diff --git a/src/grp-journal/systemd-cat/systemd-cat.completion.bash b/src/grp-journal/systemd-cat/systemd-cat.completion.bash new file mode 100644 index 0000000000..8d84042af1 --- /dev/null +++ b/src/grp-journal/systemd-cat/systemd-cat.completion.bash @@ -0,0 +1,57 @@ +# systemd-cat(1) completion -*- shell-script -*- +# +# This file is part of systemd. +# +# Copyright 2014 Thomas H.P. Andersen +# +# systemd is free software; you can redistribute it and/or modify it +# under the terms of the GNU Lesser General Public License as published by +# the Free Software Foundation; either version 2.1 of the License, or +# (at your option) any later version. +# +# systemd is distributed in the hope that it will be useful, but +# WITHOUT ANY WARRANTY; without even the implied warranty of +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU +# General Public License for more details. +# +# You should have received a copy of the GNU Lesser General Public License +# along with systemd; If not, see <http://www.gnu.org/licenses/>. + +__contains_word() { + local w word=$1; shift + for w in "$@"; do + [[ $w = "$word" ]] && return + done +} + +_systemd_cat() { + local cur=${COMP_WORDS[COMP_CWORD]} prev=${COMP_WORDS[COMP_CWORD-1]} + local i verb comps + + local -A OPTS=( + [STANDALONE]='-h --help --version' + [ARG]='-t --identifier -p --priority --level-prefix' + ) + + _init_completion || return + + if __contains_word "$prev" ${OPTS[ARG]}; then + case $prev in + --identifier|-t) + comps='' + ;; + --priority|-p) + comps='emerg alert crit err warning notice info debug' + ;; + --level-prefix) + comps='yes no' + ;; + esac + COMPREPLY=( $(compgen -W '$comps' -- "$cur") ) + return 0 + fi + + COMPREPLY=( $(compgen -W '${OPTS[*]}' -- "$cur") ) +} + +complete -F _systemd_cat systemd-cat diff --git a/src/grp-journal/systemd-cat/systemd-cat.completion.zsh b/src/grp-journal/systemd-cat/systemd-cat.completion.zsh new file mode 100644 index 0000000000..7487b00ee8 --- /dev/null +++ b/src/grp-journal/systemd-cat/systemd-cat.completion.zsh @@ -0,0 +1,12 @@ +#compdef systemd-cat + +local curcontext="$curcontext" state lstate line +_arguments \ + {-h,--help}'[Show this help]' \ + '--version[Show package version.]' \ + {-t+,--identifier=}'[Set syslog identifier.]:syslog identifier:' \ + {-p+,--priority=}'[Set priority value.]:value:({0..7})' \ + '--level-prefix=[Control whether level prefix shall be parsed.]:boolean:(1 0)' \ + ':Message' + +#vim: set ft=zsh sw=4 ts=4 et diff --git a/src/grp-journal/systemd-cat/systemd-cat.xml b/src/grp-journal/systemd-cat/systemd-cat.xml new file mode 100644 index 0000000000..160db9fb5c --- /dev/null +++ b/src/grp-journal/systemd-cat/systemd-cat.xml @@ -0,0 +1,178 @@ +<?xml version='1.0'?> <!--*-nxml-*--> +<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN" + "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd"> + +<!-- + This file is part of systemd. + + Copyright 2012 Lennart Poettering + + systemd is free software; you can redistribute it and/or modify it + under the terms of the GNU Lesser General Public License as published by + the Free Software Foundation; either version 2.1 of the License, or + (at your option) any later version. + + systemd is distributed in the hope that it will be useful, but + WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public License + along with systemd; If not, see <http://www.gnu.org/licenses/>. +--> + +<refentry id="systemd-cat" + xmlns:xi="http://www.w3.org/2001/XInclude"> + + <refentryinfo> + <title>systemd-cat</title> + <productname>systemd</productname> + + <authorgroup> + <author> + <contrib>Developer</contrib> + <firstname>Lennart</firstname> + <surname>Poettering</surname> + <email>lennart@poettering.net</email> + </author> + </authorgroup> + </refentryinfo> + + <refmeta> + <refentrytitle>systemd-cat</refentrytitle> + <manvolnum>1</manvolnum> + </refmeta> + + <refnamediv> + <refname>systemd-cat</refname> + <refpurpose>Connect a pipeline or program's output with the journal</refpurpose> + </refnamediv> + + <refsynopsisdiv> + <cmdsynopsis> + <command>systemd-cat <arg choice="opt" rep="repeat">OPTIONS</arg> <arg>COMMAND</arg> <arg choice="opt" rep="repeat">ARGUMENTS</arg></command> + </cmdsynopsis> + <cmdsynopsis> + <command>systemd-cat <arg choice="opt" rep="repeat">OPTIONS</arg></command> + </cmdsynopsis> + </refsynopsisdiv> + + <refsect1> + <title>Description</title> + + <para><command>systemd-cat</command> may be used to connect the + standard input and output of a process to the journal, or as a + filter tool in a shell pipeline to pass the output the previous + pipeline element generates to the journal.</para> + + <para>If no parameter is passed, <command>systemd-cat</command> + will write everything it reads from standard input (stdin) to the + journal.</para> + + <para>If parameters are passed, they are executed as command line + with standard output (stdout) and standard error output (stderr) + connected to the journal, so that all it writes is stored in the + journal.</para> + </refsect1> + + <refsect1> + <title>Options</title> + + <para>The following options are understood:</para> + + <variablelist> + <xi:include href="standard-options.xml" xpointer="help" /> + <xi:include href="standard-options.xml" xpointer="version" /> + + <varlistentry> + <term><option>-t</option></term> + <term><option>--identifier=</option></term> + + <listitem><para>Specify a short string that is used to + identify the logging tool. If not specified, no identification + string is written to the journal.</para></listitem> + </varlistentry> + + <varlistentry> + <term><option>-p</option></term> + <term><option>--priority=</option></term> + + <listitem><para>Specify the default priority level for the + logged messages. Pass one of + <literal>emerg</literal>, + <literal>alert</literal>, + <literal>crit</literal>, + <literal>err</literal>, + <literal>warning</literal>, + <literal>notice</literal>, + <literal>info</literal>, + <literal>debug</literal>, or a + value between 0 and 7 (corresponding to the same named + levels). These priority values are the same as defined by + <citerefentry project='man-pages'><refentrytitle>syslog</refentrytitle><manvolnum>3</manvolnum></citerefentry>. + Defaults to <literal>info</literal>. Note that this simply + controls the default, individual lines may be logged with + different levels if they are prefixed accordingly. For details, + see <option>--level-prefix=</option> below.</para></listitem> + </varlistentry> + + <varlistentry> + <term><option>--level-prefix=</option></term> + + <listitem><para>Controls whether lines read are parsed for + syslog priority level prefixes. If enabled (the default), a + line prefixed with a priority prefix such as + <literal><5></literal> is logged at priority 5 + (<literal>notice</literal>), and similar for the other + priority levels. Takes a boolean argument.</para></listitem> + </varlistentry> + + </variablelist> + + </refsect1> + + <refsect1> + <title>Exit status</title> + + <para>On success, 0 is returned, a non-zero failure code + otherwise.</para> + </refsect1> + + <refsect1> + <title>Examples</title> + + <example> + <title>Invoke a program</title> + + <para>This calls <filename noindex='true'>/bin/ls</filename> + with standard output and error connected to the journal:</para> + + <programlisting># systemd-cat ls</programlisting> + </example> + + <example> + <title>Usage in a shell pipeline</title> + + <para>This builds a shell pipeline also invoking + <filename>/bin/ls</filename> and writes the output it generates + to the journal:</para> + + <programlisting># ls | systemd-cat</programlisting> + </example> + + <para>Even though the two examples have very similar effects the + first is preferable since only one process is running at a time, + and both stdout and stderr are captured while in the second + example, only stdout is captured.</para> + </refsect1> + + <refsect1> + <title>See Also</title> + <para> + <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>, + <citerefentry><refentrytitle>systemctl</refentrytitle><manvolnum>1</manvolnum></citerefentry>, + <citerefentry project='man-pages'><refentrytitle>logger</refentrytitle><manvolnum>1</manvolnum></citerefentry> + </para> + </refsect1> + +</refentry> |